if nsends+nrecvs == 0 {
		return dflt, false
	}

	// Compact sel and orig if necessary.
	if nsends+nrecvs < len(cases) {
		copy(sel[nsends:], sel[len(cases)-nrecvs:])
		copy(orig[nsends:], orig[len(cases)-nrecvs:])
	}

	order := make([]uint16, 2*(nsends+nrecvs))
	var pc0 *uintptr
	if raceenabled {
		pcs := make([]uintptr, nsends+nrecvs)
		for i := range pcs {
			selectsetpc(&pcs[i])
		}

		exprFmt(n.X, s, nprec)
		fmt.Fprintf(s, " %v ", n.Op())
		exprFmt(n.Y, s, nprec+1)

	case OSEND:
		n := n.(*SendStmt)
		exprFmt(n.Chan, s, nprec)
		fmt.Fprintf(s, " <- ")
		exprFmt(n.Value, s, nprec+1)

	case OADDSTR:
		n := n.(*AddStringExpr)
		for i, n1 := range n.List {
			if i != 0 {
				fmt.Fprint(s, " + ")
			}
			exprFmt(n1, s, nprec)
		}
	default:

    protected abstract Long peekKey () throws IOException;


    protected abstract void doSend ( Request request ) throws IOException;


    protected abstract void doRecv ( Response response ) throws IOException;


    protected abstract void doSkip ( Long key ) throws IOException;


    /**
     * 
     * @return whether the transport is disconnected
     */

				}
				if cause != "" {
					check.errorf(recv, InvalidRecv, "invalid receiver type %s (%s)", rtyp, cause)
				}
			case *Basic:
				check.errorf(recv, InvalidRecv, "cannot define new methods on non-local type %s", rtyp)
			default:
				check.errorf(recv, InvalidRecv, "invalid receiver type %s", recv.typ)
			}
		}).describef(recv, "validate receiver %s", recv)
	}

	sig.params = NewTuple(params...)

// token to its generated `mhlo.recv`.

// CHECK-LABEL: func @host_compute_no_operands_one_result
func.func @host_compute_no_operands_one_result() {
  // CHECK:      [[INIT_TOKEN:%.*]] = mhlo.create_token

  // CHECK-NOT:  "mhlo.send"
  // CHECK-NOT:  "mhlo.after_all"
  // CHECK:      "mhlo.recv"([[INIT_TOKEN]])

		// In this case, the type of f is an interface that is itself the receiver
		// type of all of its methods. Because we have no type name to break
		// cycles, substituting in the recv results in an infinite loop of
		// recv->interface->recv->interface->...
		recv := t.recv

		params := subst.tuple(t.params)
		results := subst.tuple(t.results)
		if params != t.params || results != t.results {
			return &Signature{
				rparams: t.rparams,

		return as
	}

	switch as.Y.Op() {
	default:
		as.Y = walkExpr(as.Y, init)

	case ir.ORECV:
		// x = <-c; as.Left is x, as.Right.Left is c.
		// order.stmt made sure x is addressable.
		recv := as.Y.(*ir.UnaryExpr)
		recv.X = walkExpr(recv.X, init)

		n1 := typecheck.NodAddr(as.X)
		r := recv.X // the channel
		return mkcall1(chanfn("chanrecv1", 2, r.Type()), nil, init, r, n1)

	case ir.OAPPEND:

		// In this case, the type of f is an interface that is itself the receiver
		// type of all of its methods. Because we have no type name to break
		// cycles, substituting in the recv results in an infinite loop of
		// recv->interface->recv->interface->...
		recv := t.recv

		params := subst.tuple(t.params)
		results := subst.tuple(t.results)
		if params != t.params || results != t.results {
			return &Signature{
				rparams: t.rparams,

	}
	// function doesn't exist or has no documentation; use f
	recv := ""
	if f.Recv != nil {
		var typ ast.Expr
		// be careful in case of incorrect ASTs
		if list := f.Recv.List; len(list) == 1 {
			typ = list[0].Type
		}
		recv = recvString(typ)
	}
	mset[name] = &Func{
		Doc:  f.Doc.Text(),
		Name: name,
		Decl: f,
		Recv: recv,
		Orig: recv,
	}
	if !preserveAST {

	case TCHAN:
		switch t.ChanDir() {
		case Crecv:
			b.WriteString("<-chan ")
			tconv2(b, t.Elem(), 0, mode, visited)
		case Csend:
			b.WriteString("chan<- ")
			tconv2(b, t.Elem(), 0, mode, visited)
		default:
			b.WriteString("chan ")
			if t.Elem() != nil && t.Elem().IsChan() && t.Elem().Sym() == nil && t.Elem().ChanDir() == Crecv {
				b.WriteByte('(')
				tconv2(b, t.Elem(), 0, mode, visited)